Question

Pls help me with these 3 questions

Answer 1

sorry i don't know if I know i
would have answed

Answer 2

Hi I think

X=8(90-x)

X=720-8x

9x=720

X=80

2.the length of perpendicular from p(5,7)on ax+by+c=0is MOD of a5+b7+c/rpot of Asquare +B square

3.(5,0)